<i>Bubble Chambers</i>

Aleksandrov, Yu. A.; Voronov, G. S.; Gorbunkov, V.M.; Delone, N. B.; Nechayev, Yu. I.; Pewitt, E.G.

doi:10.1063/1.3035210

Cited by 4 publications

(10 citation statements)

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“…As expected, the relative motion accelerates bubble growing and results in a steeper slope of growth line than that under zero-gravity conditions. At the early stage (t < 5 ms) the predictions given by Wolfert [58] and Aleksandrov et al [56] agree well with the experimental data. Later on, the potential theory without consideration of heat conduction deliver the best agreement with the experimental data.…”

Section: Florschuetz Et Al Casessupporting

confidence: 80%

“…They have pressures other than 1 atm and relatively high superheats in comparison with the last two cases. Here, a generally good agreement with the experimental data is demonstrated by the heuristic correlations of Aleksandrov et al [56] and Wolfert [58]. On the other hand, the potential theory and the empirical correlation of Ranz & Marshall [42] under-predict obviously the transient bubble size.…”

Section: Kosky Casessupporting

confidence: 70%

“…The conduction effect is evident in the initial stage even at moderate Jakob numbers. In cases with high Jakob numbers, the potential theory and the Ranz & Marshall [42] correlation under-predict the bubble size significantly, while the Wolfert [58] and Aleksandrov et al [56] correlations, which account for both conduction and convection, deliver satisfying results.…”

Section: Discussionmentioning

confidence: 91%

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Evaluation of Interfacial Heat Transfer Models for Flashing Flow with Two-Fluid CFD

Liao

Lucas

2018

Fluids

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Abstract:The complexity of flashing flows is increased vastly by the interphase heat transfer as well as its coupling with mass and momentum transfers. A reliable heat transfer coefficient is the key in the modelling of such kinds of flows with the two-fluid model. An extensive literature survey on computational modelling of flashing flows has been given in previous work. The present work is aimed at giving a brief review on available theories and correlations for the estimation of interphase heat transfer coefficient, and evaluating them quantitatively based on computational fluid dynamics simulations of bubble growth in superheated liquid. The comparison of predictions for bubble growth rate obtained by using different correlations with the experimental as well as direct numerical simulation data reveals that the performance of the correlations is dependent on the Jakob number and Reynolds number. No generally applicable correlations are available. Both conduction and convection are important in cases of bubble rising and translating in stagnant liquid at high Jakob numbers. The correlations combining the analytical solution for heat diffusion and the theoretical relation for potential flow give the best agreement.

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Section: Florschuetz Et Al Casessupporting

confidence: 80%

Section: Kosky Casessupporting

confidence: 70%

Section: Discussionmentioning

confidence: 91%

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Evaluation of Interfacial Heat Transfer Models for Flashing Flow with Two-Fluid CFD

Liao

Lucas

2018

Fluids

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“…Then, a simple estimate has shown that all liquids ever studied under FAB conditions were in a superheated state under the mass spectrometric vacuum. The interaction of energetic particles with superheated liquids has been well studied in connection with problems of nuclear and elementary particles physics, since relevant information was required in the middle of the last century for designing accelerated particle detectors named ‘bubble chambers’ 24,25. On the basis of these data, a model given the name ‘bubble chamber FAB model’ is proposed, which is consistent with practically all the effects observed in FAB and liquid SIMS.…”

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confidence: 70%

‘Bubble chamber model’ of fast atom bombardment induced processes

Kosevich

Shelkovsky

Boryak

et al. 2003

Rapid Comm Mass Spectrometry

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A hypothesis concerning FAB mechanisms, referred to as a 'bubble chamber FAB model', is proposed. This model can provide an answer to the long-standing question as to how fragile biomolecules and weakly bound clusters can survive under high-energy particle impact on liquids. The basis of this model is a simple estimation of saturated vapour pressure over the surface of liquids, which shows that all liquids ever tested by fast atom bombardment (FAB) and liquid secondary ion mass spectrometry (SIMS) were in the superheated state under the experimental conditions applied. The result of the interaction of the energetic particles with superheated liquids is known to be qualitatively different from that with equilibrium liquids. It consists of initiation of local boiling, i.e., in formation of vapour bubbles along the track of the energetic particle. This phenomenon has been extensively studied in the framework of nuclear physics and provides the basis for construction of the well-known bubble chamber detectors. The possibility of occurrence of similar processes under FAB of superheated liquids substantiates a conceptual model of emission of secondary ions suggested by Vestal in 1983, which assumes formation of bubbles beneath the liquid surface, followed by their bursting accompanied by release of microdroplets and clusters as a necessary intermediate step for the creation of molecular ions. The main distinctive feature of the bubble chamber FAB model, proposed here, is that the bubbles are formed not in the space and time-restricted impact-excited zone, but in the nearby liquid as a 'normal' boiling event, which implies that the temperature both within the bubble and in the droplets emerging on its burst is practically the same as that of the bulk liquid sample. This concept can resolve the paradox of survival of intact biomolecules under FAB, since the part of the sample participating in the liquid-gas transition via the bubble mechanism has an ambient temperature which is not destructive for biomolecules. Another important feature of the model is that the timescale of bubble growth is no longer limited by the relaxation time of the excited zone ( approximately 10(-12) s), but rather resembles the timescale characteristic of common boiling, sufficient for multiple interactions of gas molecules and formation of clusters. Further, when the bubbles burst, microdroplets are released, which implies that FAB processes are similar to those in spraying techniques. Thus, two processes contribute to the ion production, namely, release of volatile solvent clusters from bubbles and of non-volatile solute from sputtered droplets. This view reconciles contradictory views on the dominance of either gas-phase or liquid-phase effects in FAB. Some other effects, such as suppression of all other ions by surface-active compounds, are consistent with the suggested model.

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“…The intensity over the CCD will then be given by the squared magnitude of the two-dimensional Fourier transform F of the previous equation, multiplied by k 2 /z 2 . Neglecting a DC spike at the centre of the resulting diffraction [156][157][158][159][160] pattern, the intensity over the surface of the CCD will be I CCD ðX,Y; tÞ ¼ 9F½I H ðx,yÞ9 2 9 Â F½PSFðx,y; tÞ9 2 Â BðtÞ; ð5aÞ…”

Section: Optical Reconstruction Approachesmentioning

confidence: 99%